Thursday, 5 July 2018

NFC (Near Field Communication): New Alternate of RFID

NFC (Near Field Communication): New Alternate of RFID

NFC stands for “Near Field Communication” and, as the name signifies, it is short range communication channel that enables communication between compatible devices. This channel requires at least one transmitting device and other receiving device. It follows the NFC standard for ranging the devices and treated them as active or passive, according to the assigned work. So, it is becoming one of most promising and latest technology.
Passive NFC devices contain tags, and other small transmitters, that can send data to other NFC build devices without processing the source data. However, passive devices don't require their own power supply and can be powered by the electromagnetic fields produced by an active NFC device when it comes in range. Active NFC devices are meant for both send and receive data, and can communicate with each other as well as with passive NFC devices. Smart phones, touch payment terminals, and public transport card readers are the finest example of active NFC devices.
Application of NFC in Access Control
The technology used in NFC is based on the RFID (Radio Frequency Identification), which works on a principle of sending information over radio waves and uses electromagnetic induction to transmit information. It is an advanced standard of wireless data transitions. The device must adhere to some specification for communication, according to the NFC standard. The transmission frequency of data across NFC is 13.56 megahertz and it enables us to send data either 106, 212 or 424 kilobits per second, which is enough to transfer contact details, pictures and music. So, the transfer of data can enable the user to authenticate their identity and get the access.
RFID(Radio Frequency Identification) is the techniques in which items are uniquely identified using radio waves and NFC is a branch of High-frequency RFID technology and both operate at the 13.56 MHz frequency. The unique feature that allows NFC devices to communicate peer-to-peer is it's secure function of data exchange. It is capable of being both an NFC reader and NFC tag.
NFC (Near Field Communication) is the connection between RFID technology and the world of mobile phones. It functions over a transmission standard for the contactless exchange of data over a distance of up to 10 cm. This standard (ISO 18092) is compatible with RF (Radio Frequency) standard ISO 14443 and allows NFC enabled devices to be used as employee ID, electronic tickets or card reader appliances.
Advantage and disadvantage of NFC
However, there are several technological competitive analysis between the NFC and other wireless devices, but NFC has significant benefits. The major benefit of NFC is that it requires less power supply and perfect for passive devices. Another major advantage of NFC is its faster connectivity. The reason behind the faster connectivity is the use of inductive coupling, and the absence of manual pairing so that it takes less than 1/10th of a second to establish a connection between the devices.
But the power saving mode of NFC does have some major drawbacks such as lower transmission range. For example, Bluetooth devices can transmit data up to 10 meters and more, but NFC can transmit data only in the range of 10 cm from the source. Another drawback of NFC is that it is quite slower than Bluetooth. It transmits data at a maximum speed of just 424 kbit/s, compared to 2.1 Mbit/s with Bluetooth 2.1 or around 1 Mbit/s with Bluetooth Low Energy.
NFC builds upon the standards of HF RFID and turns the limitations of its operating frequency into a unique feature of near-field communication.

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